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Working with rate of interests

Invest a total of $4000 in 2 stocks that paid 5% and 7% annual interests. At the end of the year total interests from these investments is $230. How much was invested at each rate?

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We will prepare two equations from the given data,
<br>Let the amounts be x and y
<br>they add up to 4000$, that is x + y = 4000 ...

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